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  Ultrafast spintronics roadmap: from femtosecond spin current pulses to terahertz non-uniform spin dynamics via nano-confined spin transfer torques

Melnikov, A., Razdolski, I., Alekhin, A., Ilin, N., Meyburg, J., Diesing, D., et al. (2016). Ultrafast spintronics roadmap: from femtosecond spin current pulses to terahertz non-uniform spin dynamics via nano-confined spin transfer torques. In H.-J. Drouhin, J.-E. Wegrowe, & M. Razeghi (Eds.), Spintronics IX. Bellingham, WA: SPIE. doi:10.1117/12.2239214.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-002C-2F13-F Version Permalink: https://hdl.handle.net/11858/00-001M-0000-002D-A66A-4
Genre: Conference Paper

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 Creators:
Melnikov, Alexey1, Author           
Razdolski, Ilya1, Author           
Alekhin, Alexandr1, Author           
Ilin, Nikita1, Author           
Meyburg, Jan2, Author
Diesing, Detlef2, Author
Bovensiepen, Uwe2, Author           
Roddatis, Vladimir3, Author
Rungger, Ivan4, Author
Stamenova, Maria4, Author
Sanvito, Stefano4, Author
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2Universität Diusburg-Essen, Fakultät für Physik, Lotharstr. 1, 47048 Duisburg, ou_persistent22              
3Institut für Materialphysik, Universität Göttingen, Göttingen (Germany), ou_persistent22              
4Trinity College Dublin, Dublin (Ireland), ou_persistent22              

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 Abstract: Further development of spintronics requires miniaturization and reduction of characteristic timescales of spin dynamics combining the nanometer spatial and femtosecond temporal ranges. These demands shift the focus of interest towards the fundamental open question of the interaction of femtosecond spin current (SC) pulses with a ferromagnet (FM). The spatio-temporal properties of the spin transfer torque (STT) exerted by ultrashort SC pulses on the FM open the time domain for studying STT fingerprint on spatially non-uniform magnetization dynamics. Using the sensitivity of magneto-induced second harmonic generation to SC, we develop technique for SC monitoring. With 20 fs resolution, we demonstrate the generation of 250 fs-long SC pulses in Fe/Au/Fe/MgO(001) structures. Their temporal profile indicates (i) nearly-ballistic hot electron transport in Au and (ii) that the pulse duration is primarily determined by the thermalization time of laser-excited hot carriers in Fe. Together with strongly spin-dependent Fe/Au interface transmission calculated for these carriers, this suggests the non-thermal spin-dependent Seebeck effect dominating the generation of ultrashort SC pulses. The analysis of SC transmission/reflection at the Au/Fe interface shows that hot electron spins orthogonal to the Fe magnetization rotate gaining huge parallel (anti-parallel) projection in transmitted (reflected) SC. This is accompanied by a STT-induced perturbation of the magnetization localized at the interface, which excites the inhomogeneous high-frequency spin dynamics in the FM. Time-resolved magneto-optical studies reveal the excitation of several standing spin wave modes in the Fe film with their spectrum extending up to 0.6 THz and indicating the STT spatial confinement to 2 nm. © (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

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Language(s): eng - English
 Dates: 2016-11-042016-11-04
 Publication Status: Issued
 Pages: 1
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1117/12.2239214
 Degree: -

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Title: Spintronics IX
Place of Event: San Diego, California, United States
Start-/End Date: 2016-08-28 - 2016-09-01

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Title: Spintronics IX
Source Genre: Book
 Creator(s):
Drouhin, Henri-Jean, Editor
Wegrowe, Jean-Eric, Editor
Razeghi, Manijeh, Editor
Affiliations:
-
Publ. Info: Bellingham, WA : SPIE
Pages: 1 Volume / Issue: - Sequence Number: 99311A Start / End Page: - Identifier: ISSN: 0277-786X

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Title: Proceedings of SPIE
Source Genre: Series
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Pages: - Volume / Issue: 9931 Sequence Number: - Start / End Page: - Identifier: -